7/18/2019 1430467116xii Physics Nitika Assgnmnt01

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BAL BHAVAN PUBLIC SCHOOLCLASS-XII

ASSIGNMENT-01

GENERAL INSTRUCTIONS:

  All questions are compulsory.

  There are 10 questions in all.

  Submission Date:08/05/2015

Q1 

Two infinite parallel planes have uniform charge densities. Determinethe electric field at points (i) to the left of the sheets (ii) between them

(iii) to the right of the sheets.Q2

 

Three charges –q, +Q & -q are placed at equal distances on a straightline. If the potential energy of the system is zero, find the ratio Q/q.

Q3 

Find the electrostatic P.E of the configuration of four charges +q, -q,

+q & -q placed at the four corners A,B,C,D of a square of side a.Q4

 

Calculate the electric field due to an electric dipole of length 10cm

having charges of 1C at an equatorial point 12cm from the centre of thedipole.

Q5 

Electrostatic experiments do not work well on humid days. Explain.Q6

 

Two positive charges Q & 4Q are fixed at a distance of 12cm from

each other. Sketch the lines of force & locate the neutral points if any.

Q7 

Why a circuit containing capacitors should be handled cautiously, evenwhen there is no current?

Q8  Derive an expression for the electric field intensity at some point on the

equatorial & axial line?Q9

 

Two electrons, each moving with a velocity of 106m/s, are released

towards each other. What will be the closest distance of approach

 between them?Q10

 

Why insulators are called dielectrics & conductors as non-electrics?